The excavator shows weak operation under the condition of sufficient engine power and normal operation. It may be caused by the incorrect setting pressure of the relevant multi-channel valve body:
The multi way distribution valve is a very important hydraulic component in hydraulic excavator. The main safety valve, secondary valve, overflow valve and oil filling valve and other important parts are attached to it. If the pressure set by these valves is not up to the standard pressure, the excavator will be unable to dig directly. In addition, if the valve stem and valve hole wear, the clearance between the two is too large, resulting in incomplete valve stem return, improper reversing, a large amount of hydraulic oil leakage, resulting in insufficient flow and slow speed will also lead to the excavator excavation is weak. In this case, the multiple distribution valve shall be removed and sent to the test bench for commissioning, the pressure of all valves shall be reset to the standard pressure, and the clearance between the valve stem and valve hole shall be eliminated.
If the excavator is cold machine, but the excavation is not enough when the machine is hot, it indicates that the internal parts of the hydraulic pump are severely worn, the vulnerable parts in the pump must be replaced, reassembled and the test bench shall be adjusted for calibration. In addition, the quality of hydraulic oil in the hydraulic system of excavator will also affect the whole machine action of excavator, which makes the machine work slowly and powerless. During the operation of the machine, it is necessary to monitor the viscosity and fluidity of hydraulic oil, and to detect the cleanliness of hydraulic oil and replace the hydraulic oil in accordance with the regulations.
